onBeforeEventDragOut is not working

Have a question, as mentioned in this link onBeforeEventDragOut can be used if user drags out from scheduler while creating an event, and furrther action can be taken for this. But tries to use the same event which is not getting fired while taking the above mentioned action.
Other side of it the documentation is not very clear for achieving this functionality which all the files are needed to include, but I tried including dhtmlxscheduler_drag_between.js and dhtmlxscheduler_outerdrag.js these two files but still I don’t see the onBeforeEventDragOut event is being fired on scrolling outside of the scheduler.

Please suggest if anyone has any solution for this.